LM845 - WiFi 802.11ac + Bluetooth 4.2 USB Nano Adapter | LM Technologies
料号： LM845 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.95 | $1,395.00 |
| 500 | $11.8 | $5,900.00 |
| 1,000 | $9.95 | $9,950.00 |
LM845 概述
A WiFi + Bluetooth USB combo dongle is a peripheral that adds short-range wireless connectivity to a host PC, embedded board, or industrial appliance via the USB bus. Inside the dongle, a single radio SoC handles both WiFi (the 802.11 family) and Bluetooth (BR/EDR/LE), sharing one antenna chain through an internal RF front-end. The host sees two logical interfaces (a network interface for WiFi and an HCI interface for Bluetooth) over USB, which simplifies driver integration and shrinks the dongle to a nano form factor that can be left plugged into a laptop or set-top box.
Key features of the LM845 include 1-stream 802.11ac Wave-2 operation with MU-MIMO, dual-band 2.4/5 GHz support, Bluetooth 4.2 Dual Mode (BR/EDR + LE) with simultaneous Classic + LE links, a USB 2.0 high-speed host interface, and a Realtek-based single-chip radio that minimizes BOM and power draw. The dongle form factor is sized for always-on installation in laptops, mini-PCs, and industrial HMIs.
The internal architecture relies on a Realtek combo MAC/baseband IC with an integrated 2.4/5 GHz PA/LNA chain. WiFi throughput reaches 433 Mbps on the 5 GHz 802.11ac 1x1 link, while Bluetooth supports the standard BR/EDR profiles plus BLE GATT services for IoT pairing and beaconing. Because WiFi and Bluetooth share the same RF chain, the firmware coordinates time-division scheduling to avoid mutual interference.
Typical applications include adding dual-band WiFi 5 + Bluetooth to legacy desktop or embedded systems, IoT gateways and industrial PCs that need a quick wireless drop-in upgrade, point-of-sale terminals that pair with BLE peripherals, retrofitted media PCs and set-top boxes that need 5 GHz WiFi for HD streaming, and developer/test rigs that require a stable Realtek-based combo radio for driver qualification.
When designing with the LM845, remember that it is a finished USB dongle, not a bare IC: designers cannot change the antenna, regulators, or USB stack. Host drivers must support the underlying Realtek chipset for full 802.11ac + Bluetooth 4.2 functionality, and the host OS USB port must provide enough bus power for the 5 GHz PA under load.
This page synthesizes verified distributor information, parametric specifications, and design guidance not consolidated on any single manufacturer or distributor page, including practical notes on host-driver compatibility and concurrent WiFi + Bluetooth operation.
直接替换替代料： LM845 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LM845 （相同外形与封装尺寸） ——差异在于 Chipset, Form Factor, Host Interface, Modulation, Product Type.
快速对比工具——选择替代料号进行并排对比：
LM808
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$11.05 / 个
查看数据手册 →LM816
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$7.4 / 个
查看数据手册 →Archer T2U Nano
✅ 直接替换📋 参考替代料（不在目录中）
EW-7611ULB
✅ 直接替换📋 参考替代料（不在目录中）
UB500
✅ 直接替换📋 参考替代料（不在目录中）
LM845 规格参数（制造商发布）
| Product Type | USB WiFi + Bluetooth combo nano adapter (dongle) |
| WiFi Standard | IEEE 802.11ac/a/b/g/n (WiFi 5, 1-stream) |
| WiFi Bands | 2.4 GHz and 5 GHz dual-band |
| MU-MIMO | Supported (Multi-User MIMO) |
| Maximum WiFi Throughput | 433 Mbps (802.11ac 1x1, 80 MHz) |
| Bluetooth Standard | Bluetooth v4.2 Dual Mode (BR/EDR + LE) |
| Bluetooth Backward Compatibility | v2.1+EDR, v3.0 |
| Concurrent Bluetooth Operation | Classic (BR/EDR) and Low Energy (LE) simultaneously |
| Host Interface | USB 2.0 (Type-A connector, nano form factor) |
| Chipset | Realtek single-chip WiFi + Bluetooth combo |
| Antenna | Internal printed/shared antenna chain (per datasheet) |
| Form Factor | Nano USB dongle |
| Power Supply | USB bus powered (5 V from host) |
| RoHS 状态 | Compliant (per LM Technologies product page) |
| Compliance | IEEE 802.11ac, Bluetooth v4.2 |
LM845 接口与连接器
LM845 提供制造商发布的以下接口和连接器：无线, 蓝牙。扩展排针引脚定义、连接器引脚编号和电气限值在制造商文档中定义。
| 无线 | IEEE 802.11ac/a/b/g/n (WiFi 5, 1-stream) |
| 蓝牙 | Bluetooth v4.2 Dual Mode (BR/EDR + LE) |
请参阅 制造商文档 以查看完整的扩展排针引脚和连接器引脚编号。
典型应用
LM845 适用于 6 应用s: Legacy Desktop WiFi 5 Upgrade, Industrial PC and HMI Wireless Drop-In, Point-of-Sale Terminal Bluetooth Pairing, Set-Top Box and Media PC WiFi Add-On, IoT Gateway and Developer Test Rig, Embedded Linux Single-Board Computer Wireless.
Legacy Desktop WiFi 5 Upgrade
The LM845 brings 5 GHz 802.11ac to a desktop PC that only has 10/100 Ethernet or an obsolete 2.4 GHz WiFi card. Its 433 Mbps peak throughput on a clean 5 GHz channel is more than enough for 4K streaming and large file transfers, and the nano housing leaves adjacent USB ports unobstructed. With 1-stream 802.11ac and MU-MIMO awareness, the LM845 negotiates properly with modern WiFi 5 routers without driver stack changes on Windows or Linux hosts that ship the Realtek driver for this chipset.
推荐
Industrial PC and HMI Wireless Drop-In
Factory HMIs and industrial PCs frequently ship without 5 GHz radios or Bluetooth, and the LM845 is a clean field-upgrade path. Plug the dongle into any USB 2.0 port on the HMI, load the Realtek driver on the Linux BSP, and the device gains concurrent WiFi 5 to the plant network and BLE to nearby sensors or barcode scanners. Because the LM845 draws all power from the USB 5 V rail, no internal wiring or PSU changes are required, which simplifies retrofit installation on legacy IPCs.
推荐
Point-of-Sale Terminal Bluetooth Pairing
POS terminals need a stable Bluetooth link to receipt printers, barcode scanners, and payment PEDs while staying on the store WiFi. The LM845's Bluetooth 4.2 Dual Mode lets the POS pair with a BLE payment terminal and a Classic Bluetooth printer simultaneously, while its 5 GHz WiFi 5 link keeps transactions flowing on a low-interference band. The nano form factor stays flush with the POS chassis and survives the constant plugging typical of retail environments.
推荐
Set-Top Box and Media PC WiFi Add-On
Older set-top boxes, Android TV sticks, and media PCs without 5 GHz WiFi choke on HD streaming when forced onto a congested 2.4 GHz network. The LM845 upgrades them to dual-band 802.11ac with 433 Mbps of clean 5 GHz throughput, enough for multiple HD streams and over-the-top services. Its USB bus-powered design and Realtek driver support on Linux-based media player distributions make it a common drop-in accessory in this segment.
推荐
IoT Gateway and Developer Test Rig
IoT gateways and engineering test rigs often need a known-good combo radio to validate WiFi coexistence, BLE provisioning flows, or driver bring-up. The LM845 is a popular reference design built around the Realtek 1x1 802.11ac + BT 4.2 chipset, which is the same silicon family used in many commercial gateways. Designers can plug it into a Linux dev board, validate throughput and coexistence behavior, and then port the same driver stack to a custom gateway design.
推荐
Embedded Linux Single-Board Computer Wireless
Single-board computers like the Raspberry Pi or industrial SBCs often ship with 2.4 GHz-only radios or no radio at all, and developers need a quick path to dual-band WiFi plus Bluetooth. The LM845 plugs into any USB 2.0 host port and is recognized by mainstream Linux kernels (with the appropriate Realtek out-of-tree driver) as both a WiFi network interface and a Bluetooth HCI device. This dual personality from one dongle saves a USB port compared to using separate WiFi and Bluetooth adapters.
推荐
推荐产品汇总
工程参考数据： LM845 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LM808 | LM816 | Archer T2U Nano | EW-7611ULB | UB500 |
|---|---|---|---|---|---|---|
| Brand | LM Technologies | LM Technologies | LM Technologies | TP-Link | Edimax | TP-Link |
| Package | USB Nano Dongle | USB Nano Dongle - same | USB Nano Dongle - same | USB Nano Dongle - same | USB Nano Dongle - same | USB Nano Dongle - same |
| WiFi Standard | 802.11ac/a/b/g/n (WiFi 5) | 802.11b/g/n (WiFi 4, 2.4 GHz only) | N/A (Bluetooth-only) | 802.11ac/a/b/g/n (WiFi 5) | 802.11ac/a/b/g/n (WiFi 5) | N/A (Bluetooth-only) |
| WiFi Bands | 2.4 GHz + 5 GHz dual-band | 2.4 GHz only | N/A | 2.4 GHz + 5 GHz dual-band | 2.4 GHz + 5 GHz dual-band | N/A |
| Max WiFi Throughput | 433 Mbps (1x1 802.11ac) | 150 Mbps (1x1 802.11n) | N/A | 433 Mbps (1x1 802.11ac) | 433 Mbps (1x1 802.11ac) | N/A |
| Bluetooth | v4.2 Dual Mode (BR/EDR + LE) | None | Bluetooth (Classic) | None | Bluetooth 4.2 | Bluetooth 5.0 |
| MU-MIMO | Yes | No | N/A | No (1x1) | No (1x1) | N/A |
| Host Interface | USB 2.0 Type-A | USB 2.0 Type-A | USB 2.0 Type-A | USB 2.0 Type-A | USB 2.0 Type-A | USB 2.0 Type-A |
关键差异点
- True dual-band WiFi 5 + Bluetooth 4.2 in one nano dongle （对比 LM808)
- MU-MIMO awareness on a 1-stream radio （对比 Archer T2U Nano)
- Concurrent Classic Bluetooth + BLE （对比 UB500)
设计说明
Estimated: The LM845 is a finished USB dongle, not a pin-compatible IC. There is no PCB-level 'drop-in' alternative at the silicon level because the antenna, regulators, and USB connector are pre-integrated into the housing. When a design seems to require a replacement, treat any alternative USB dongle as a peripheral swap and re-validate the host driver stack and regulatory certifications rather than treating it as a true IC drop-in.
Estimated: The LM845 draws all power from the host USB 5 V rail. Under 5 GHz 802.11ac transmit bursts, the dongle can pull close to the USB 2.0 high-power unit load (500 mA). If the host is a power-constrained SBC or a hub without an external supply, throughput on the 5 GHz radio can degrade during PA peaks; in that case, plug the LM845 directly into the host or use a powered hub.
Because the LM845 is a sealed nano dongle with an internal antenna, the RF environment around the USB port directly affects throughput. Plugging the dongle into a USB port on the rear of a metal PC chassis, or behind a TV, can attenuate the 5 GHz signal by 10-15 dB. Use a short USB extension cable to move the dongle into line-of-sight with the access point whenever possible.
On Linux hosts, the LM845 typically requires the out-of-tree Realtek driver (rtl88XX series) plus Bluetooth firmware files placed in /lib/firmware. Build the module against the running kernel and confirm that bluetoothd can attach the HCI device; without the firmware blob, WiFi may associate but Bluetooth will fail to enumerate. macOS support is not guaranteed for every Realtek combo chipset and should be tested before deployment.
合规信息
RoHS compliance per LM Technologies product page. Detailed REACH, halogen-free, and conflict-minerals disclosures are not published on the public datasheet; request the full compliance statement from LM Technologies for industrial procurement.